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14cf11af | 1 | /* |
14cf11af PM |
2 | * Derived from "arch/i386/kernel/process.c" |
3 | * Copyright (C) 1995 Linus Torvalds | |
4 | * | |
5 | * Updated and modified by Cort Dougan (cort@cs.nmt.edu) and | |
6 | * Paul Mackerras (paulus@cs.anu.edu.au) | |
7 | * | |
8 | * PowerPC version | |
9 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License | |
13 | * as published by the Free Software Foundation; either version | |
14 | * 2 of the License, or (at your option) any later version. | |
15 | */ | |
16 | ||
17 | #include <linux/config.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/sched.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/smp.h> | |
23 | #include <linux/smp_lock.h> | |
24 | #include <linux/stddef.h> | |
25 | #include <linux/unistd.h> | |
26 | #include <linux/ptrace.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/user.h> | |
29 | #include <linux/elf.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/prctl.h> | |
32 | #include <linux/init_task.h> | |
33 | #include <linux/module.h> | |
34 | #include <linux/kallsyms.h> | |
35 | #include <linux/mqueue.h> | |
36 | #include <linux/hardirq.h> | |
06d67d54 | 37 | #include <linux/utsname.h> |
14cf11af PM |
38 | |
39 | #include <asm/pgtable.h> | |
40 | #include <asm/uaccess.h> | |
41 | #include <asm/system.h> | |
42 | #include <asm/io.h> | |
43 | #include <asm/processor.h> | |
44 | #include <asm/mmu.h> | |
45 | #include <asm/prom.h> | |
76032de8 | 46 | #include <asm/machdep.h> |
c6622f63 | 47 | #include <asm/time.h> |
06d67d54 PM |
48 | #ifdef CONFIG_PPC64 |
49 | #include <asm/firmware.h> | |
06d67d54 | 50 | #endif |
14cf11af PM |
51 | |
52 | extern unsigned long _get_SP(void); | |
53 | ||
54 | #ifndef CONFIG_SMP | |
55 | struct task_struct *last_task_used_math = NULL; | |
56 | struct task_struct *last_task_used_altivec = NULL; | |
57 | struct task_struct *last_task_used_spe = NULL; | |
58 | #endif | |
59 | ||
14cf11af PM |
60 | /* |
61 | * Make sure the floating-point register state in the | |
62 | * the thread_struct is up to date for task tsk. | |
63 | */ | |
64 | void flush_fp_to_thread(struct task_struct *tsk) | |
65 | { | |
66 | if (tsk->thread.regs) { | |
67 | /* | |
68 | * We need to disable preemption here because if we didn't, | |
69 | * another process could get scheduled after the regs->msr | |
70 | * test but before we have finished saving the FP registers | |
71 | * to the thread_struct. That process could take over the | |
72 | * FPU, and then when we get scheduled again we would store | |
73 | * bogus values for the remaining FP registers. | |
74 | */ | |
75 | preempt_disable(); | |
76 | if (tsk->thread.regs->msr & MSR_FP) { | |
77 | #ifdef CONFIG_SMP | |
78 | /* | |
79 | * This should only ever be called for current or | |
80 | * for a stopped child process. Since we save away | |
81 | * the FP register state on context switch on SMP, | |
82 | * there is something wrong if a stopped child appears | |
83 | * to still have its FP state in the CPU registers. | |
84 | */ | |
85 | BUG_ON(tsk != current); | |
86 | #endif | |
87 | giveup_fpu(current); | |
88 | } | |
89 | preempt_enable(); | |
90 | } | |
91 | } | |
92 | ||
93 | void enable_kernel_fp(void) | |
94 | { | |
95 | WARN_ON(preemptible()); | |
96 | ||
97 | #ifdef CONFIG_SMP | |
98 | if (current->thread.regs && (current->thread.regs->msr & MSR_FP)) | |
99 | giveup_fpu(current); | |
100 | else | |
101 | giveup_fpu(NULL); /* just enables FP for kernel */ | |
102 | #else | |
103 | giveup_fpu(last_task_used_math); | |
104 | #endif /* CONFIG_SMP */ | |
105 | } | |
106 | EXPORT_SYMBOL(enable_kernel_fp); | |
107 | ||
108 | int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpregs) | |
109 | { | |
110 | if (!tsk->thread.regs) | |
111 | return 0; | |
112 | flush_fp_to_thread(current); | |
113 | ||
114 | memcpy(fpregs, &tsk->thread.fpr[0], sizeof(*fpregs)); | |
115 | ||
116 | return 1; | |
117 | } | |
118 | ||
119 | #ifdef CONFIG_ALTIVEC | |
120 | void enable_kernel_altivec(void) | |
121 | { | |
122 | WARN_ON(preemptible()); | |
123 | ||
124 | #ifdef CONFIG_SMP | |
125 | if (current->thread.regs && (current->thread.regs->msr & MSR_VEC)) | |
126 | giveup_altivec(current); | |
127 | else | |
128 | giveup_altivec(NULL); /* just enable AltiVec for kernel - force */ | |
129 | #else | |
130 | giveup_altivec(last_task_used_altivec); | |
131 | #endif /* CONFIG_SMP */ | |
132 | } | |
133 | EXPORT_SYMBOL(enable_kernel_altivec); | |
134 | ||
135 | /* | |
136 | * Make sure the VMX/Altivec register state in the | |
137 | * the thread_struct is up to date for task tsk. | |
138 | */ | |
139 | void flush_altivec_to_thread(struct task_struct *tsk) | |
140 | { | |
141 | if (tsk->thread.regs) { | |
142 | preempt_disable(); | |
143 | if (tsk->thread.regs->msr & MSR_VEC) { | |
144 | #ifdef CONFIG_SMP | |
145 | BUG_ON(tsk != current); | |
146 | #endif | |
147 | giveup_altivec(current); | |
148 | } | |
149 | preempt_enable(); | |
150 | } | |
151 | } | |
152 | ||
153 | int dump_task_altivec(struct pt_regs *regs, elf_vrregset_t *vrregs) | |
154 | { | |
155 | flush_altivec_to_thread(current); | |
156 | memcpy(vrregs, ¤t->thread.vr[0], sizeof(*vrregs)); | |
157 | return 1; | |
158 | } | |
159 | #endif /* CONFIG_ALTIVEC */ | |
160 | ||
161 | #ifdef CONFIG_SPE | |
162 | ||
163 | void enable_kernel_spe(void) | |
164 | { | |
165 | WARN_ON(preemptible()); | |
166 | ||
167 | #ifdef CONFIG_SMP | |
168 | if (current->thread.regs && (current->thread.regs->msr & MSR_SPE)) | |
169 | giveup_spe(current); | |
170 | else | |
171 | giveup_spe(NULL); /* just enable SPE for kernel - force */ | |
172 | #else | |
173 | giveup_spe(last_task_used_spe); | |
174 | #endif /* __SMP __ */ | |
175 | } | |
176 | EXPORT_SYMBOL(enable_kernel_spe); | |
177 | ||
178 | void flush_spe_to_thread(struct task_struct *tsk) | |
179 | { | |
180 | if (tsk->thread.regs) { | |
181 | preempt_disable(); | |
182 | if (tsk->thread.regs->msr & MSR_SPE) { | |
183 | #ifdef CONFIG_SMP | |
184 | BUG_ON(tsk != current); | |
185 | #endif | |
186 | giveup_spe(current); | |
187 | } | |
188 | preempt_enable(); | |
189 | } | |
190 | } | |
191 | ||
192 | int dump_spe(struct pt_regs *regs, elf_vrregset_t *evrregs) | |
193 | { | |
194 | flush_spe_to_thread(current); | |
195 | /* We copy u32 evr[32] + u64 acc + u32 spefscr -> 35 */ | |
196 | memcpy(evrregs, ¤t->thread.evr[0], sizeof(u32) * 35); | |
197 | return 1; | |
198 | } | |
199 | #endif /* CONFIG_SPE */ | |
200 | ||
5388fb10 | 201 | #ifndef CONFIG_SMP |
48abec07 PM |
202 | /* |
203 | * If we are doing lazy switching of CPU state (FP, altivec or SPE), | |
204 | * and the current task has some state, discard it. | |
205 | */ | |
5388fb10 | 206 | void discard_lazy_cpu_state(void) |
48abec07 | 207 | { |
48abec07 PM |
208 | preempt_disable(); |
209 | if (last_task_used_math == current) | |
210 | last_task_used_math = NULL; | |
211 | #ifdef CONFIG_ALTIVEC | |
212 | if (last_task_used_altivec == current) | |
213 | last_task_used_altivec = NULL; | |
214 | #endif /* CONFIG_ALTIVEC */ | |
215 | #ifdef CONFIG_SPE | |
216 | if (last_task_used_spe == current) | |
217 | last_task_used_spe = NULL; | |
218 | #endif | |
219 | preempt_enable(); | |
48abec07 | 220 | } |
5388fb10 | 221 | #endif /* CONFIG_SMP */ |
48abec07 | 222 | |
624cee31 | 223 | #ifdef CONFIG_PPC_MERGE /* XXX for now */ |
14cf11af PM |
224 | int set_dabr(unsigned long dabr) |
225 | { | |
cab0af98 ME |
226 | if (ppc_md.set_dabr) |
227 | return ppc_md.set_dabr(dabr); | |
14cf11af | 228 | |
cab0af98 ME |
229 | mtspr(SPRN_DABR, dabr); |
230 | return 0; | |
14cf11af | 231 | } |
624cee31 | 232 | #endif |
14cf11af | 233 | |
06d67d54 PM |
234 | #ifdef CONFIG_PPC64 |
235 | DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array); | |
14cf11af | 236 | static DEFINE_PER_CPU(unsigned long, current_dabr); |
06d67d54 | 237 | #endif |
14cf11af PM |
238 | |
239 | struct task_struct *__switch_to(struct task_struct *prev, | |
240 | struct task_struct *new) | |
241 | { | |
242 | struct thread_struct *new_thread, *old_thread; | |
243 | unsigned long flags; | |
244 | struct task_struct *last; | |
245 | ||
246 | #ifdef CONFIG_SMP | |
247 | /* avoid complexity of lazy save/restore of fpu | |
248 | * by just saving it every time we switch out if | |
249 | * this task used the fpu during the last quantum. | |
250 | * | |
251 | * If it tries to use the fpu again, it'll trap and | |
252 | * reload its fp regs. So we don't have to do a restore | |
253 | * every switch, just a save. | |
254 | * -- Cort | |
255 | */ | |
256 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_FP)) | |
257 | giveup_fpu(prev); | |
258 | #ifdef CONFIG_ALTIVEC | |
259 | /* | |
260 | * If the previous thread used altivec in the last quantum | |
261 | * (thus changing altivec regs) then save them. | |
262 | * We used to check the VRSAVE register but not all apps | |
263 | * set it, so we don't rely on it now (and in fact we need | |
264 | * to save & restore VSCR even if VRSAVE == 0). -- paulus | |
265 | * | |
266 | * On SMP we always save/restore altivec regs just to avoid the | |
267 | * complexity of changing processors. | |
268 | * -- Cort | |
269 | */ | |
270 | if (prev->thread.regs && (prev->thread.regs->msr & MSR_VEC)) | |
271 | giveup_altivec(prev); | |
14cf11af PM |
272 | #endif /* CONFIG_ALTIVEC */ |
273 | #ifdef CONFIG_SPE | |
274 | /* | |
275 | * If the previous thread used spe in the last quantum | |
276 | * (thus changing spe regs) then save them. | |
277 | * | |
278 | * On SMP we always save/restore spe regs just to avoid the | |
279 | * complexity of changing processors. | |
280 | */ | |
281 | if ((prev->thread.regs && (prev->thread.regs->msr & MSR_SPE))) | |
282 | giveup_spe(prev); | |
c0c0d996 PM |
283 | #endif /* CONFIG_SPE */ |
284 | ||
285 | #else /* CONFIG_SMP */ | |
286 | #ifdef CONFIG_ALTIVEC | |
287 | /* Avoid the trap. On smp this this never happens since | |
288 | * we don't set last_task_used_altivec -- Cort | |
289 | */ | |
290 | if (new->thread.regs && last_task_used_altivec == new) | |
291 | new->thread.regs->msr |= MSR_VEC; | |
292 | #endif /* CONFIG_ALTIVEC */ | |
293 | #ifdef CONFIG_SPE | |
14cf11af PM |
294 | /* Avoid the trap. On smp this this never happens since |
295 | * we don't set last_task_used_spe | |
296 | */ | |
297 | if (new->thread.regs && last_task_used_spe == new) | |
298 | new->thread.regs->msr |= MSR_SPE; | |
299 | #endif /* CONFIG_SPE */ | |
c0c0d996 | 300 | |
14cf11af PM |
301 | #endif /* CONFIG_SMP */ |
302 | ||
303 | #ifdef CONFIG_PPC64 /* for now */ | |
304 | if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr)) { | |
305 | set_dabr(new->thread.dabr); | |
306 | __get_cpu_var(current_dabr) = new->thread.dabr; | |
307 | } | |
06d67d54 PM |
308 | |
309 | flush_tlb_pending(); | |
14cf11af PM |
310 | #endif |
311 | ||
312 | new_thread = &new->thread; | |
313 | old_thread = ¤t->thread; | |
06d67d54 PM |
314 | |
315 | #ifdef CONFIG_PPC64 | |
316 | /* | |
317 | * Collect processor utilization data per process | |
318 | */ | |
319 | if (firmware_has_feature(FW_FEATURE_SPLPAR)) { | |
320 | struct cpu_usage *cu = &__get_cpu_var(cpu_usage_array); | |
321 | long unsigned start_tb, current_tb; | |
322 | start_tb = old_thread->start_tb; | |
323 | cu->current_tb = current_tb = mfspr(SPRN_PURR); | |
324 | old_thread->accum_tb += (current_tb - start_tb); | |
325 | new_thread->start_tb = current_tb; | |
326 | } | |
327 | #endif | |
328 | ||
14cf11af | 329 | local_irq_save(flags); |
c6622f63 PM |
330 | |
331 | account_system_vtime(current); | |
332 | account_process_vtime(current); | |
333 | calculate_steal_time(); | |
334 | ||
14cf11af PM |
335 | last = _switch(old_thread, new_thread); |
336 | ||
337 | local_irq_restore(flags); | |
338 | ||
339 | return last; | |
340 | } | |
341 | ||
06d67d54 PM |
342 | static int instructions_to_print = 16; |
343 | ||
344 | #ifdef CONFIG_PPC64 | |
345 | #define BAD_PC(pc) ((REGION_ID(pc) != KERNEL_REGION_ID) && \ | |
346 | (REGION_ID(pc) != VMALLOC_REGION_ID)) | |
347 | #else | |
348 | #define BAD_PC(pc) ((pc) < KERNELBASE) | |
349 | #endif | |
350 | ||
351 | static void show_instructions(struct pt_regs *regs) | |
352 | { | |
353 | int i; | |
354 | unsigned long pc = regs->nip - (instructions_to_print * 3 / 4 * | |
355 | sizeof(int)); | |
356 | ||
357 | printk("Instruction dump:"); | |
358 | ||
359 | for (i = 0; i < instructions_to_print; i++) { | |
360 | int instr; | |
361 | ||
362 | if (!(i % 8)) | |
363 | printk("\n"); | |
364 | ||
365 | if (BAD_PC(pc) || __get_user(instr, (unsigned int *)pc)) { | |
366 | printk("XXXXXXXX "); | |
367 | } else { | |
368 | if (regs->nip == pc) | |
369 | printk("<%08x> ", instr); | |
370 | else | |
371 | printk("%08x ", instr); | |
372 | } | |
373 | ||
374 | pc += sizeof(int); | |
375 | } | |
376 | ||
377 | printk("\n"); | |
378 | } | |
379 | ||
380 | static struct regbit { | |
381 | unsigned long bit; | |
382 | const char *name; | |
383 | } msr_bits[] = { | |
384 | {MSR_EE, "EE"}, | |
385 | {MSR_PR, "PR"}, | |
386 | {MSR_FP, "FP"}, | |
387 | {MSR_ME, "ME"}, | |
388 | {MSR_IR, "IR"}, | |
389 | {MSR_DR, "DR"}, | |
390 | {0, NULL} | |
391 | }; | |
392 | ||
393 | static void printbits(unsigned long val, struct regbit *bits) | |
394 | { | |
395 | const char *sep = ""; | |
396 | ||
397 | printk("<"); | |
398 | for (; bits->bit; ++bits) | |
399 | if (val & bits->bit) { | |
400 | printk("%s%s", sep, bits->name); | |
401 | sep = ","; | |
402 | } | |
403 | printk(">"); | |
404 | } | |
405 | ||
406 | #ifdef CONFIG_PPC64 | |
407 | #define REG "%016lX" | |
408 | #define REGS_PER_LINE 4 | |
409 | #define LAST_VOLATILE 13 | |
410 | #else | |
411 | #define REG "%08lX" | |
412 | #define REGS_PER_LINE 8 | |
413 | #define LAST_VOLATILE 12 | |
414 | #endif | |
415 | ||
14cf11af PM |
416 | void show_regs(struct pt_regs * regs) |
417 | { | |
418 | int i, trap; | |
419 | ||
06d67d54 PM |
420 | printk("NIP: "REG" LR: "REG" CTR: "REG"\n", |
421 | regs->nip, regs->link, regs->ctr); | |
422 | printk("REGS: %p TRAP: %04lx %s (%s)\n", | |
423 | regs, regs->trap, print_tainted(), system_utsname.release); | |
424 | printk("MSR: "REG" ", regs->msr); | |
425 | printbits(regs->msr, msr_bits); | |
426 | printk(" CR: %08lX XER: %08lX\n", regs->ccr, regs->xer); | |
14cf11af PM |
427 | trap = TRAP(regs); |
428 | if (trap == 0x300 || trap == 0x600) | |
06d67d54 PM |
429 | printk("DAR: "REG", DSISR: "REG"\n", regs->dar, regs->dsisr); |
430 | printk("TASK = %p[%d] '%s' THREAD: %p", | |
b5e2fc1c | 431 | current, current->pid, current->comm, task_thread_info(current)); |
14cf11af PM |
432 | |
433 | #ifdef CONFIG_SMP | |
434 | printk(" CPU: %d", smp_processor_id()); | |
435 | #endif /* CONFIG_SMP */ | |
436 | ||
437 | for (i = 0; i < 32; i++) { | |
06d67d54 | 438 | if ((i % REGS_PER_LINE) == 0) |
14cf11af | 439 | printk("\n" KERN_INFO "GPR%02d: ", i); |
06d67d54 PM |
440 | printk(REG " ", regs->gpr[i]); |
441 | if (i == LAST_VOLATILE && !FULL_REGS(regs)) | |
14cf11af PM |
442 | break; |
443 | } | |
444 | printk("\n"); | |
445 | #ifdef CONFIG_KALLSYMS | |
446 | /* | |
447 | * Lookup NIP late so we have the best change of getting the | |
448 | * above info out without failing | |
449 | */ | |
06d67d54 | 450 | printk("NIP ["REG"] ", regs->nip); |
14cf11af | 451 | print_symbol("%s\n", regs->nip); |
06d67d54 | 452 | printk("LR ["REG"] ", regs->link); |
14cf11af PM |
453 | print_symbol("%s\n", regs->link); |
454 | #endif | |
455 | show_stack(current, (unsigned long *) regs->gpr[1]); | |
06d67d54 PM |
456 | if (!user_mode(regs)) |
457 | show_instructions(regs); | |
14cf11af PM |
458 | } |
459 | ||
460 | void exit_thread(void) | |
461 | { | |
48abec07 | 462 | discard_lazy_cpu_state(); |
14cf11af PM |
463 | } |
464 | ||
465 | void flush_thread(void) | |
466 | { | |
06d67d54 PM |
467 | #ifdef CONFIG_PPC64 |
468 | struct thread_info *t = current_thread_info(); | |
469 | ||
470 | if (t->flags & _TIF_ABI_PENDING) | |
471 | t->flags ^= (_TIF_ABI_PENDING | _TIF_32BIT); | |
472 | #endif | |
06d67d54 | 473 | |
48abec07 | 474 | discard_lazy_cpu_state(); |
14cf11af PM |
475 | |
476 | #ifdef CONFIG_PPC64 /* for now */ | |
477 | if (current->thread.dabr) { | |
478 | current->thread.dabr = 0; | |
479 | set_dabr(0); | |
480 | } | |
481 | #endif | |
482 | } | |
483 | ||
484 | void | |
485 | release_thread(struct task_struct *t) | |
486 | { | |
487 | } | |
488 | ||
489 | /* | |
490 | * This gets called before we allocate a new thread and copy | |
491 | * the current task into it. | |
492 | */ | |
493 | void prepare_to_copy(struct task_struct *tsk) | |
494 | { | |
495 | flush_fp_to_thread(current); | |
496 | flush_altivec_to_thread(current); | |
497 | flush_spe_to_thread(current); | |
498 | } | |
499 | ||
500 | /* | |
501 | * Copy a thread.. | |
502 | */ | |
06d67d54 PM |
503 | int copy_thread(int nr, unsigned long clone_flags, unsigned long usp, |
504 | unsigned long unused, struct task_struct *p, | |
505 | struct pt_regs *regs) | |
14cf11af PM |
506 | { |
507 | struct pt_regs *childregs, *kregs; | |
508 | extern void ret_from_fork(void); | |
0cec6fd1 | 509 | unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE; |
14cf11af PM |
510 | |
511 | CHECK_FULL_REGS(regs); | |
512 | /* Copy registers */ | |
513 | sp -= sizeof(struct pt_regs); | |
514 | childregs = (struct pt_regs *) sp; | |
515 | *childregs = *regs; | |
516 | if ((childregs->msr & MSR_PR) == 0) { | |
517 | /* for kernel thread, set `current' and stackptr in new task */ | |
518 | childregs->gpr[1] = sp + sizeof(struct pt_regs); | |
06d67d54 | 519 | #ifdef CONFIG_PPC32 |
14cf11af | 520 | childregs->gpr[2] = (unsigned long) p; |
06d67d54 | 521 | #else |
b5e2fc1c | 522 | clear_tsk_thread_flag(p, TIF_32BIT); |
06d67d54 | 523 | #endif |
14cf11af PM |
524 | p->thread.regs = NULL; /* no user register state */ |
525 | } else { | |
526 | childregs->gpr[1] = usp; | |
527 | p->thread.regs = childregs; | |
06d67d54 PM |
528 | if (clone_flags & CLONE_SETTLS) { |
529 | #ifdef CONFIG_PPC64 | |
530 | if (!test_thread_flag(TIF_32BIT)) | |
531 | childregs->gpr[13] = childregs->gpr[6]; | |
532 | else | |
533 | #endif | |
534 | childregs->gpr[2] = childregs->gpr[6]; | |
535 | } | |
14cf11af PM |
536 | } |
537 | childregs->gpr[3] = 0; /* Result from fork() */ | |
538 | sp -= STACK_FRAME_OVERHEAD; | |
14cf11af PM |
539 | |
540 | /* | |
541 | * The way this works is that at some point in the future | |
542 | * some task will call _switch to switch to the new task. | |
543 | * That will pop off the stack frame created below and start | |
544 | * the new task running at ret_from_fork. The new task will | |
545 | * do some house keeping and then return from the fork or clone | |
546 | * system call, using the stack frame created above. | |
547 | */ | |
548 | sp -= sizeof(struct pt_regs); | |
549 | kregs = (struct pt_regs *) sp; | |
550 | sp -= STACK_FRAME_OVERHEAD; | |
551 | p->thread.ksp = sp; | |
14cf11af | 552 | |
06d67d54 PM |
553 | #ifdef CONFIG_PPC64 |
554 | if (cpu_has_feature(CPU_FTR_SLB)) { | |
555 | unsigned long sp_vsid = get_kernel_vsid(sp); | |
3c726f8d | 556 | unsigned long llp = mmu_psize_defs[mmu_linear_psize].sllp; |
06d67d54 PM |
557 | |
558 | sp_vsid <<= SLB_VSID_SHIFT; | |
3c726f8d | 559 | sp_vsid |= SLB_VSID_KERNEL | llp; |
06d67d54 PM |
560 | p->thread.ksp_vsid = sp_vsid; |
561 | } | |
562 | ||
563 | /* | |
564 | * The PPC64 ABI makes use of a TOC to contain function | |
565 | * pointers. The function (ret_from_except) is actually a pointer | |
566 | * to the TOC entry. The first entry is a pointer to the actual | |
567 | * function. | |
568 | */ | |
569 | kregs->nip = *((unsigned long *)ret_from_fork); | |
570 | #else | |
571 | kregs->nip = (unsigned long)ret_from_fork; | |
14cf11af | 572 | p->thread.last_syscall = -1; |
06d67d54 | 573 | #endif |
14cf11af PM |
574 | |
575 | return 0; | |
576 | } | |
577 | ||
578 | /* | |
579 | * Set up a thread for executing a new program | |
580 | */ | |
06d67d54 | 581 | void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp) |
14cf11af | 582 | { |
90eac727 ME |
583 | #ifdef CONFIG_PPC64 |
584 | unsigned long load_addr = regs->gpr[2]; /* saved by ELF_PLAT_INIT */ | |
585 | #endif | |
586 | ||
14cf11af | 587 | set_fs(USER_DS); |
06d67d54 PM |
588 | |
589 | /* | |
590 | * If we exec out of a kernel thread then thread.regs will not be | |
591 | * set. Do it now. | |
592 | */ | |
593 | if (!current->thread.regs) { | |
0cec6fd1 AV |
594 | struct pt_regs *regs = task_stack_page(current) + THREAD_SIZE; |
595 | current->thread.regs = regs - 1; | |
06d67d54 PM |
596 | } |
597 | ||
14cf11af PM |
598 | memset(regs->gpr, 0, sizeof(regs->gpr)); |
599 | regs->ctr = 0; | |
600 | regs->link = 0; | |
601 | regs->xer = 0; | |
602 | regs->ccr = 0; | |
14cf11af | 603 | regs->gpr[1] = sp; |
06d67d54 PM |
604 | |
605 | #ifdef CONFIG_PPC32 | |
606 | regs->mq = 0; | |
607 | regs->nip = start; | |
14cf11af | 608 | regs->msr = MSR_USER; |
06d67d54 | 609 | #else |
d4bf9a78 | 610 | if (!test_thread_flag(TIF_32BIT)) { |
90eac727 | 611 | unsigned long entry, toc; |
06d67d54 PM |
612 | |
613 | /* start is a relocated pointer to the function descriptor for | |
614 | * the elf _start routine. The first entry in the function | |
615 | * descriptor is the entry address of _start and the second | |
616 | * entry is the TOC value we need to use. | |
617 | */ | |
618 | __get_user(entry, (unsigned long __user *)start); | |
619 | __get_user(toc, (unsigned long __user *)start+1); | |
620 | ||
621 | /* Check whether the e_entry function descriptor entries | |
622 | * need to be relocated before we can use them. | |
623 | */ | |
624 | if (load_addr != 0) { | |
625 | entry += load_addr; | |
626 | toc += load_addr; | |
627 | } | |
628 | regs->nip = entry; | |
629 | regs->gpr[2] = toc; | |
630 | regs->msr = MSR_USER64; | |
d4bf9a78 SR |
631 | } else { |
632 | regs->nip = start; | |
633 | regs->gpr[2] = 0; | |
634 | regs->msr = MSR_USER32; | |
06d67d54 PM |
635 | } |
636 | #endif | |
637 | ||
48abec07 | 638 | discard_lazy_cpu_state(); |
14cf11af | 639 | memset(current->thread.fpr, 0, sizeof(current->thread.fpr)); |
25c8a78b | 640 | current->thread.fpscr.val = 0; |
14cf11af PM |
641 | #ifdef CONFIG_ALTIVEC |
642 | memset(current->thread.vr, 0, sizeof(current->thread.vr)); | |
643 | memset(¤t->thread.vscr, 0, sizeof(current->thread.vscr)); | |
06d67d54 | 644 | current->thread.vscr.u[3] = 0x00010000; /* Java mode disabled */ |
14cf11af PM |
645 | current->thread.vrsave = 0; |
646 | current->thread.used_vr = 0; | |
647 | #endif /* CONFIG_ALTIVEC */ | |
648 | #ifdef CONFIG_SPE | |
649 | memset(current->thread.evr, 0, sizeof(current->thread.evr)); | |
650 | current->thread.acc = 0; | |
651 | current->thread.spefscr = 0; | |
652 | current->thread.used_spe = 0; | |
653 | #endif /* CONFIG_SPE */ | |
654 | } | |
655 | ||
656 | #define PR_FP_ALL_EXCEPT (PR_FP_EXC_DIV | PR_FP_EXC_OVF | PR_FP_EXC_UND \ | |
657 | | PR_FP_EXC_RES | PR_FP_EXC_INV) | |
658 | ||
659 | int set_fpexc_mode(struct task_struct *tsk, unsigned int val) | |
660 | { | |
661 | struct pt_regs *regs = tsk->thread.regs; | |
662 | ||
663 | /* This is a bit hairy. If we are an SPE enabled processor | |
664 | * (have embedded fp) we store the IEEE exception enable flags in | |
665 | * fpexc_mode. fpexc_mode is also used for setting FP exception | |
666 | * mode (asyn, precise, disabled) for 'Classic' FP. */ | |
667 | if (val & PR_FP_EXC_SW_ENABLE) { | |
668 | #ifdef CONFIG_SPE | |
669 | tsk->thread.fpexc_mode = val & | |
670 | (PR_FP_EXC_SW_ENABLE | PR_FP_ALL_EXCEPT); | |
06d67d54 | 671 | return 0; |
14cf11af PM |
672 | #else |
673 | return -EINVAL; | |
674 | #endif | |
14cf11af | 675 | } |
06d67d54 PM |
676 | |
677 | /* on a CONFIG_SPE this does not hurt us. The bits that | |
678 | * __pack_fe01 use do not overlap with bits used for | |
679 | * PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits | |
680 | * on CONFIG_SPE implementations are reserved so writing to | |
681 | * them does not change anything */ | |
682 | if (val > PR_FP_EXC_PRECISE) | |
683 | return -EINVAL; | |
684 | tsk->thread.fpexc_mode = __pack_fe01(val); | |
685 | if (regs != NULL && (regs->msr & MSR_FP) != 0) | |
686 | regs->msr = (regs->msr & ~(MSR_FE0|MSR_FE1)) | |
687 | | tsk->thread.fpexc_mode; | |
14cf11af PM |
688 | return 0; |
689 | } | |
690 | ||
691 | int get_fpexc_mode(struct task_struct *tsk, unsigned long adr) | |
692 | { | |
693 | unsigned int val; | |
694 | ||
695 | if (tsk->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE) | |
696 | #ifdef CONFIG_SPE | |
697 | val = tsk->thread.fpexc_mode; | |
698 | #else | |
699 | return -EINVAL; | |
700 | #endif | |
701 | else | |
702 | val = __unpack_fe01(tsk->thread.fpexc_mode); | |
703 | return put_user(val, (unsigned int __user *) adr); | |
704 | } | |
705 | ||
06d67d54 PM |
706 | #define TRUNC_PTR(x) ((typeof(x))(((unsigned long)(x)) & 0xffffffff)) |
707 | ||
14cf11af PM |
708 | int sys_clone(unsigned long clone_flags, unsigned long usp, |
709 | int __user *parent_tidp, void __user *child_threadptr, | |
710 | int __user *child_tidp, int p6, | |
711 | struct pt_regs *regs) | |
712 | { | |
713 | CHECK_FULL_REGS(regs); | |
714 | if (usp == 0) | |
715 | usp = regs->gpr[1]; /* stack pointer for child */ | |
06d67d54 PM |
716 | #ifdef CONFIG_PPC64 |
717 | if (test_thread_flag(TIF_32BIT)) { | |
718 | parent_tidp = TRUNC_PTR(parent_tidp); | |
719 | child_tidp = TRUNC_PTR(child_tidp); | |
720 | } | |
721 | #endif | |
14cf11af PM |
722 | return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp); |
723 | } | |
724 | ||
725 | int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3, | |
726 | unsigned long p4, unsigned long p5, unsigned long p6, | |
727 | struct pt_regs *regs) | |
728 | { | |
729 | CHECK_FULL_REGS(regs); | |
730 | return do_fork(SIGCHLD, regs->gpr[1], regs, 0, NULL, NULL); | |
731 | } | |
732 | ||
733 | int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3, | |
734 | unsigned long p4, unsigned long p5, unsigned long p6, | |
735 | struct pt_regs *regs) | |
736 | { | |
737 | CHECK_FULL_REGS(regs); | |
738 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gpr[1], | |
739 | regs, 0, NULL, NULL); | |
740 | } | |
741 | ||
742 | int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2, | |
743 | unsigned long a3, unsigned long a4, unsigned long a5, | |
744 | struct pt_regs *regs) | |
745 | { | |
746 | int error; | |
06d67d54 | 747 | char *filename; |
14cf11af PM |
748 | |
749 | filename = getname((char __user *) a0); | |
750 | error = PTR_ERR(filename); | |
751 | if (IS_ERR(filename)) | |
752 | goto out; | |
753 | flush_fp_to_thread(current); | |
754 | flush_altivec_to_thread(current); | |
755 | flush_spe_to_thread(current); | |
20c8c210 PM |
756 | error = do_execve(filename, (char __user * __user *) a1, |
757 | (char __user * __user *) a2, regs); | |
14cf11af PM |
758 | if (error == 0) { |
759 | task_lock(current); | |
760 | current->ptrace &= ~PT_DTRACE; | |
761 | task_unlock(current); | |
762 | } | |
763 | putname(filename); | |
764 | out: | |
765 | return error; | |
766 | } | |
767 | ||
768 | static int validate_sp(unsigned long sp, struct task_struct *p, | |
769 | unsigned long nbytes) | |
770 | { | |
0cec6fd1 | 771 | unsigned long stack_page = (unsigned long)task_stack_page(p); |
14cf11af PM |
772 | |
773 | if (sp >= stack_page + sizeof(struct thread_struct) | |
774 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
775 | return 1; | |
776 | ||
777 | #ifdef CONFIG_IRQSTACKS | |
778 | stack_page = (unsigned long) hardirq_ctx[task_cpu(p)]; | |
779 | if (sp >= stack_page + sizeof(struct thread_struct) | |
780 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
781 | return 1; | |
782 | ||
783 | stack_page = (unsigned long) softirq_ctx[task_cpu(p)]; | |
784 | if (sp >= stack_page + sizeof(struct thread_struct) | |
785 | && sp <= stack_page + THREAD_SIZE - nbytes) | |
786 | return 1; | |
787 | #endif | |
788 | ||
789 | return 0; | |
790 | } | |
791 | ||
06d67d54 PM |
792 | #ifdef CONFIG_PPC64 |
793 | #define MIN_STACK_FRAME 112 /* same as STACK_FRAME_OVERHEAD, in fact */ | |
794 | #define FRAME_LR_SAVE 2 | |
795 | #define INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD + 288) | |
796 | #define REGS_MARKER 0x7265677368657265ul | |
797 | #define FRAME_MARKER 12 | |
798 | #else | |
799 | #define MIN_STACK_FRAME 16 | |
800 | #define FRAME_LR_SAVE 1 | |
801 | #define INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD) | |
802 | #define REGS_MARKER 0x72656773ul | |
803 | #define FRAME_MARKER 2 | |
14cf11af | 804 | #endif |
14cf11af PM |
805 | |
806 | unsigned long get_wchan(struct task_struct *p) | |
807 | { | |
808 | unsigned long ip, sp; | |
809 | int count = 0; | |
810 | ||
811 | if (!p || p == current || p->state == TASK_RUNNING) | |
812 | return 0; | |
813 | ||
814 | sp = p->thread.ksp; | |
06d67d54 | 815 | if (!validate_sp(sp, p, MIN_STACK_FRAME)) |
14cf11af PM |
816 | return 0; |
817 | ||
818 | do { | |
819 | sp = *(unsigned long *)sp; | |
06d67d54 | 820 | if (!validate_sp(sp, p, MIN_STACK_FRAME)) |
14cf11af PM |
821 | return 0; |
822 | if (count > 0) { | |
06d67d54 | 823 | ip = ((unsigned long *)sp)[FRAME_LR_SAVE]; |
14cf11af PM |
824 | if (!in_sched_functions(ip)) |
825 | return ip; | |
826 | } | |
827 | } while (count++ < 16); | |
828 | return 0; | |
829 | } | |
830 | EXPORT_SYMBOL(get_wchan); | |
06d67d54 PM |
831 | |
832 | static int kstack_depth_to_print = 64; | |
833 | ||
834 | void show_stack(struct task_struct *tsk, unsigned long *stack) | |
835 | { | |
836 | unsigned long sp, ip, lr, newsp; | |
837 | int count = 0; | |
838 | int firstframe = 1; | |
839 | ||
840 | sp = (unsigned long) stack; | |
841 | if (tsk == NULL) | |
842 | tsk = current; | |
843 | if (sp == 0) { | |
844 | if (tsk == current) | |
845 | asm("mr %0,1" : "=r" (sp)); | |
846 | else | |
847 | sp = tsk->thread.ksp; | |
848 | } | |
849 | ||
850 | lr = 0; | |
851 | printk("Call Trace:\n"); | |
852 | do { | |
853 | if (!validate_sp(sp, tsk, MIN_STACK_FRAME)) | |
854 | return; | |
855 | ||
856 | stack = (unsigned long *) sp; | |
857 | newsp = stack[0]; | |
858 | ip = stack[FRAME_LR_SAVE]; | |
859 | if (!firstframe || ip != lr) { | |
860 | printk("["REG"] ["REG"] ", sp, ip); | |
861 | print_symbol("%s", ip); | |
862 | if (firstframe) | |
863 | printk(" (unreliable)"); | |
864 | printk("\n"); | |
865 | } | |
866 | firstframe = 0; | |
867 | ||
868 | /* | |
869 | * See if this is an exception frame. | |
870 | * We look for the "regshere" marker in the current frame. | |
871 | */ | |
872 | if (validate_sp(sp, tsk, INT_FRAME_SIZE) | |
873 | && stack[FRAME_MARKER] == REGS_MARKER) { | |
874 | struct pt_regs *regs = (struct pt_regs *) | |
875 | (sp + STACK_FRAME_OVERHEAD); | |
876 | printk("--- Exception: %lx", regs->trap); | |
877 | print_symbol(" at %s\n", regs->nip); | |
878 | lr = regs->link; | |
879 | print_symbol(" LR = %s\n", lr); | |
880 | firstframe = 1; | |
881 | } | |
882 | ||
883 | sp = newsp; | |
884 | } while (count++ < kstack_depth_to_print); | |
885 | } | |
886 | ||
887 | void dump_stack(void) | |
888 | { | |
889 | show_stack(current, NULL); | |
890 | } | |
891 | EXPORT_SYMBOL(dump_stack); | |
cb2c9b27 AB |
892 | |
893 | #ifdef CONFIG_PPC64 | |
894 | void ppc64_runlatch_on(void) | |
895 | { | |
896 | unsigned long ctrl; | |
897 | ||
898 | if (cpu_has_feature(CPU_FTR_CTRL) && !test_thread_flag(TIF_RUNLATCH)) { | |
899 | HMT_medium(); | |
900 | ||
901 | ctrl = mfspr(SPRN_CTRLF); | |
902 | ctrl |= CTRL_RUNLATCH; | |
903 | mtspr(SPRN_CTRLT, ctrl); | |
904 | ||
905 | set_thread_flag(TIF_RUNLATCH); | |
906 | } | |
907 | } | |
908 | ||
909 | void ppc64_runlatch_off(void) | |
910 | { | |
911 | unsigned long ctrl; | |
912 | ||
913 | if (cpu_has_feature(CPU_FTR_CTRL) && test_thread_flag(TIF_RUNLATCH)) { | |
914 | HMT_medium(); | |
915 | ||
916 | clear_thread_flag(TIF_RUNLATCH); | |
917 | ||
918 | ctrl = mfspr(SPRN_CTRLF); | |
919 | ctrl &= ~CTRL_RUNLATCH; | |
920 | mtspr(SPRN_CTRLT, ctrl); | |
921 | } | |
922 | } | |
923 | #endif |